Yeah you won't be commuting at either airline. If you come, you have to let go of your current home life and commit to living in Dubai or Doha. Bid for trips home, bring your relatives over to stay often - but don't focus on how many days you can get off in a row in order to commute - it will leave you disappointed and vulnerable to rosters/upgrade/leave/disruption etc.
Staying until 1500 hrs PIC is a reasonable choice. Keep in mind that if you come as an FO, most DEC contracts will want recency in the LHS as a joining requirement - so that hedge of having PIC time will be quickly lost. Also many big operators want 4000+ hrs PIC to be eligible for a DEC contract, so have a look at what waiting for 1500 hours will actually get you.